An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no effects of air?
A) 0.50 s
B) 0.88 s
C) 1.1 s
D) 2.5 s
E) 0.54 s
C
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If a nucleus decays by ?- decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more protons than the original nucleus. B) The daughter nucleus has more neutrons than the original nucleus. C) The daughter nucleus has the same number of nucleons as the original nucleus. D) The daughter nucleus has fewer protons than the original nucleus. E) The daughter nucleus has fewer neutrons than the original nucleus.
A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?
A. 59 mT B. 62 mT C. 65 mT D. 68 mT E. 31 mT
If all the asteroids were gathered into a single object, it would make an object
A) about the size of Earth's moon. B) about the size of the Earth. C) about half the diameter of Earth's moon. D) with enough mass to gather hydrogen and helium and become a gas giant.
An electron with a charge value of 1.6 × 10^?19 C is moving in the presence of an electric field of 400 N/C. What force does the electron experience?
a. 8.0E–21 N b. 6.4E–22 N c. 6.4E–17 N d. 4.0E+17 N e. 1.6E–17 N